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- Suppose the hourly wages of all workers in a manufacturer company have a normal distribution with a mean of $15.50 and a standard deviation of $2.75. If we randomly select a sample of 10 workers from this company, find the probability that their mean hourly wage is:
- Less than $14.25
- More than $16.50
- Suppose the monthly salary of teacher with no more than 5 years teaching experience in California follows a normal distribution with the mean of $6250 and standard deviation of $320.
- What is the probability that a randomly selected teacher with no more than 5 years teaching experience in California makes less than $6000 or more than $6500 per month?
- Find a range of salaries, rounded to the nearest ten, that separates the middle 80% from the rest.
- Samsung TV have normal distribution of no repairs time with the mean of 9.5 years and standard deviation of 1.75 years. If we randomly select 1 Samsung TV, find the probability that
- No repair is needed between 5 to 9 years.
- Find two values that separates the middle 60% from the rest
- If we randomly select 4 such TVs, find the probability that their mean is above 8.
- A loaded coin with .65 probability of tails is tossed 800 times. Find the following:
- n=
- p=
- q=
- μ=
- σ2=
- σ=
- Find P(number of tails is at least 460)
- Estimate Pnumber of tails is at least 460 using normal distribution.
- Use a uniform probability distribution for all values from 20 to 50.
- Draw and label
- Find P(x=25)
- Find P(x<25.5 or x>35)
- Find two values that separates the middle 60% from the rest
- Suppose you buy 1 ticket for $1 out of a lottery of 1,000 tickets where the prize for one winning ticket is to be $500. Find the expected value.
- Given the following probability distribution table,
x | P(x) | |
1 | .12 | |
2 | ||
3 | .3 | |
4 | .23 | |
5 | .12 | |
- Find P(x=2)
- Draw and label probability distribution histogram
- Find μ and σ
- Find the exact value for σ2
- Use one decimal place to find the usual range
- Suppose there are 10 females and 15 males. Select 3 people.
- How many ways can we select 3 people?
- How many ways can we select 3 females?
- Find P(3 females)
- How many ways can we select 2 females? Keep in mind, we must select 3 people.
- Find P(2F and 1M)
- P(1F and 2M)
- P(0F and 3M)
- Suppose PA=.7, PB=.3, A&B are I.E.
- Find P(A and B)
- Find P(A or B)
- Make venn diagram
- Find PAB=
- Find PBA=
- nswer the following questions given the table below .
Do you drink?
Freq | Yes | No | Total |
Males | 17 | 23 | 40 |
Females | 20 | 40 | 60 |
Total | 37 | 63 | 100 |
- Find PMY
- Find P(N|F)
- Find P(Male or no)
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